Forced-draft system and smoke-consumer.



F. P. MILLER.

FQRCNDRAFT sYsEMAND SMOKE CONSUMER.

APPLICATION FILED APR. 6,1918.

Patented Mar. 18, N19.

oooowosu gal/manic@ FREEMAN 1. MILLER, 0E BALDWINsvILLE, NEW YORK.

FORCED-DRAFT SYSTEM AND SMOKE-CONSUMER.

Specification of Letters Patent.' Patented Mal, 18, 191,9.

Application filed April 6, 1918. Serial No. 227,027. I

To all whom t may concern:

Be it known that I, FREEMAN P. MILLER, a citizen of the United States ofAmerica, and resident of Baldwinsville, in the county of Onondaga andState of New York, have invented certain new and useful Improvements inForced-Draft Systems and Smoke-Com sumers, of which the following is aspecica.- tion.

This invention relates to steam boiler furnaces and particularly to asmoke consumer and fuel saver for such furnaces and the said inventionrelates particularly to means for feeding air and steam to supportcombustion in a steam boiler furnace.

An object of this invention is to provide novel means whereby air is fedunder the grate bars and directed upwardly through the grate bars undera pressure suiicien-t to create a forced draft and hence it results inpreventing the formation of clinkers and insures an even temperaturewhich can be controlled by the supply of air and the pressure at whichit is furnished.

A further obj ect of this invention is to provide means for feeding|steam to the products of combustion issuing from the, fire box forallaying smoke and insuring more complete consumption of the products ofcombustion as they pass over the bridge and prior to their circulationthrough the draft tubes of a boiler.

It has been found in practice that a device embodying the inventioneects a reduction in the coal consumed, a vast proportional reduction inthe ashes, while at the same time, it prevents fouling of the tubes andotherwise effects a saving as compared with known methods.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, ref- Y erence will be had to theaccompanying drawings forming part of this specification, wherein likecharacters denote corresponding parts in the several views, and inwhich- Figure 1 illustrates a horizontal sectional view of a fire boxwith the invention applied thereto; and

Fig. 2 illustrates a vertical sectional view.

In these drawings 5 denotes the rate bars of a steam boiler furnace, 6the fire ox, 7 the ash pit and 8 the bridge, which parts may be ofordinary arrangement as it is the purpose I one of the walls of the irebox and preferably parallel with the front wall of the fire box.v Ablower 10 is coupled to the outer end of the header and the blower maybe driven by a motor 1l and connected by a belt or the like 12. I do notwish to be limited with respect to the manner of driving theblower,however, as it may be driven from an engine by suitable connections froma main drive shaft which arrangement will be understood by those skilledin the art and need not, it is thought, be illustrated in detail.

A series of pipes 13 are coupled to the header 9 and they preferablyextend horizontally and rearw-ardly from the front wallv of .the firebox and preferably under the grate bars. The pipes 13 have perforations14 for discharging air and these perforations are on the Lipper sides ofthe pipes so that the air discharged is in the general direction of thedraft and through the spaces between the grate bars. Owing to the factthat the pipes are well distributed throughout the area of the gratebars, the air can be forced through the grate bars practicallythroughout the area of the re bed so that there will be uniformcombustion of the fuel throughout thel said area. The inner ends of thepipes 13 are closed by caps 15 which may be threaded or otherwiseapplied to them, and hence air can only escape from the pipes throughthe Y perforations. Y

A perforated pipe 16- is stationed transversely of the burners back ofthe bridge and has a coupling 17 with a pipe 18 leading to a source ofsteam supply which may be the boiler of a furnace and the pipe has avalve 19 by which steam may be controlled. The pipe 16 has a cap 20 atits' end so as to prevent escape of steam except through the aperturesand they are so arranged as to diffuse or distribute the steam so thatit will intermingle with the products of combustion passing over thebridge and aid in the more complete consumption of the products and thearrest of smoke so that the products of combustion passing through theiiues will be free of dense smoke and will have an increased heatingeifect as compared with the products of combustion 'passing through ilotubes if the air and steam feedingl means were not employed.

The pressure of the air may be controlledY Control of the valve 19 andthe'feeding of the air or vapors for supporting combustion may beregulated, according to the condition of the fire.

I claim: p

l. In a steam boiler furnace, having a grate and fire box, an airfeeding pipe, a plurality of perforated pipes in communication therewithand extendingl under the grate, said' perforated pipesl having theirinner ends elosedxmeans for supplying air to the first mentioned pipe,and a perforated pipe extending transversely of the furnace back of thefire box, and means for supplying steam thereto. i

2. In al steam boiler furnace having a grate and lire box, an airfeeding pipe, a plurality of perforated pipes in communication therewithand extending underrthe gra-te, said perforated pipes having their innerends closed, means for supplying air vto the first mentioned pipe, ablower on the. irst mentioned pipe, means for operating the blower, aperforated pipe extendingtransversely of the furnace back of the firebox,rand means for supplying steam thereto.

FREEMAN RMLLERQ i Copies' of this patent maybe' obtained for :fiveYdents Veach, by addressing the Commissioner of Patents,

Washington, D. C.

